checkpoint
Some improvements
More prep work for multi-file conversion
Image saving on ubuntu flakey
New QVideoFrame to QImage converters
  * QMFrameGlRenderYuv meant to be an opengl shader YUV420P -> RGB converter, but D410 dev laptop supports OpenGL 1.4 and some shader code not working
  * QMFrameSoftwareRenderYuv is a software converter which works
  * Multiple frame converter, but it appears that not all frames are being converted